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\leftline{\Large\bf Part II Project Progress Report}
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\leftline{{\bf Name:} Matthew Thomson}
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\leftline{{\bf Email:} mt521@cam.ac.uk}
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\leftline{{\bf Project:} Dolphin: networking using sound}
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\leftline{{\bf Supervisor:} Oliver R. A. Chick}
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\leftline{{\bf Directors of Studies:} Graham Titmus and Peter Robinson}
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\leftline{{\bf Overseers:} Peter Robinson and Robert Watson}
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The aim of this project is to transfer data using sound as the transmission device. So far I have completed the code for converting any file, or series of bytes, into a unique sound in two different ways. The first assigns each byte sequence to one of 255 distinct frequencies, which are then sent linearly. The second assigns each 2-bit block to one of 4 distinct frequencies, which are then sent much faster. I intend to do tests to determine which of these methods is more efficient. This was scheduled to be completed by November 30th.

I have begun the code for converting sounds back into bit sequences. To do this I have located Java libraries which evaluate a Fast Fourier Transform, and have included those libraries in my project. At that point I needed to better understand how the FFT works, and how much of the technique I needed to use to determine the frequency of a sine wave. To do this I departed slightly from the schedule and began writing the preparation section of my dissertation, previously scheduled for Fortnight 7 (22nd Feb). This means the blocks of work allocated between Fortnights 4 and 7 have been delayed a fortnight.

The main difficulties which have arisen have been receiving unusual errors from the FFT library, which means looking through hundreds of lines of someone elses code to see what is going wrong. This has slowed development of the sound decoder considerably. As a result, I am two weeks behind my schedule, allowing for the rearrangement of Fortnight 7. I am confident this will not affect the final deadline stated in the proposal as I allowed ample time for writing the dissertation and was also generous with the time it will take to complete the extension. Once the milestone of decoding a sound has been reached, work will progress much more rapidly.

My revised deadlines are as follows:\\
{\bf February 8th} Code for converting sound to bits complete.\\
{\bf February 22nd} Tests for efficiency of various methods complete, results graphed. Extension started.\\
{\bf March 8th} Extension complete.\\
{\bf March 22nd} Introduction and Preparation complete. Implementation underway.\\
{\bf April 5th} Implementation and Evaluation complete.\\
{\bf April 19th} Dissertation complete.\\

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